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《Geography and Geo-Information Science》 2009-01
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Global 3D-Grid Based on Sphere Degenerated Octree and Its Distortion Features

WU Li-xin1,YU Jie-qing2(1.Academy of Disaster Reduction and Emergency Management,Ministry of Civil Affairs,Ministry of Education(Beijing Normal University),Beijing 100875;2.College of Resource and Safety Engineering,China University of Mining Technology,Beijing 100083,China)  
Projection-based metric space transformation had brought geometric fissures and projection distortions for global GIS and regional GIS.The fundamental solution is to set up an uniform spatial reference framework for the Earth directly based on sphere space.By extending the surface discrete global grids to the inner of the Earth,this paper proposed a new method for global three-dimensional grid subdivision named as Sphere Degenerated Octree Grid(SDOG),which is based on sphere degenerated octree.SDOG has the features of multi-hierarchy,multi-resolution,and distortion stability both in grid area and grid volume.SDOG can do orderly and multi-hierarchy subdivision on any sphere including the Earth,and can provide three-dimensional uniform spatial reference framework,without projection distortion and data fissure,for global spatial data integral organization and indexing,multi-hierarchy spatial modeling and large scale visualization,and Earth system scientific research.
【Fund】: 国家863计划项目(2006AA12Z216);; 国家杰出青年基金项目(50525414);; 国家自然科学基金项目(40571137)
【CateGory Index】: P208
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【Citations】
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【Co-citations】
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